Propriedades vibracionais no composto Aurivillius Bi₃Fe₀ ₅Nb₁ ₅O₉
保存先:
| 第一著者: | |
|---|---|
| 出版日付: | 2012 |
| フォーマット: | Master thesis |
| 言語: | por |
| ソース: | Repositório Comum do Brasil - Deposita |
| Download full: | https://deposita.ibict.br/handle/deposita/721 |
要約: | In this work we investigated the vibrational and dielectric properties of the ceramic Bi₃Fe₀ ₅Nb₁ ₅O₉(BFN) at room temperature by using the Raman and infrared spectroscopic techniques along with classical lattice dynamics calculations. Concerning the Raman modes, fifteen vibrational modes at room temperature, were observed and classified based on performed lattice dynamics calculations. The temperature dependent Raman spectra showed clearly the ferroelectric phase transition in BFN at around 250 ° C, as discussed in the literature. The dielectric properties as well as Longitudinal (LO) and Transverse (TO) optical modes were obtained by adjusting the reflectivity spectrum of BFN at room temperature. We calculated static dielectric constant as εs = 30, which is relatively larger than the minimum value required for passive devices used in microwave electronics (εs > 10). Finally, we determined the dielectric loss in the microwave region yielding a quality factor Q = 2040 (10 GHz). |
類似資料: Propriedades vibracionais no composto Aurivillius Bi₃Fe₀ ₅Nb₁ ₅O₉
- Detecção de pesticidas em cascas de alimentos por espectroscopia Raman amplificada por superfície e quimiometria
- Síntese e caracterização de perovskitas quádruplas multiferróicas
- Análise de curto-circuito em trilhas de circuito impresso utilizando espectroscopia de impedância elétrica
- Evocação indevida de IG e impedimentos marcário: notas a partir do contencioso CIVC × rosa champagne
- O Direito Real de Uso como Instrumento de Defesa da Propriedade em face da Usucapião
- Proteção patentária para produtos e processos farmacêuticos: a questão da constitucionalidade das patentes pipeline